Echarts 的Formatter的回调函数

 option = {
   tooltip: {
     trigger: 'axis',
     formatter: function (params,ticket,callback) {
       let res = params[0].name;
       for (let i = 0, l = params.length; i < l; i++) {
         res += '<br/>' + params[i].marker + params[i].seriesName + ' : ' + params[i].value + 'KB/s';
       }
       return res
     },
     axisPointer: {
       type: 'shadow'
     }
   },
   legend: {
     itemGap: 15,
     top: 20,
     data: ['流出', '流入']
   },
   color: ['#5170ac', '#77acff'],
   grid: {
     left: '3%',
     right: '4%',
     bottom: '0%',
     containLabel: true
   },
   xAxis: {
     type: 'value',
     position: 'top',
     show : false,
   },
   yAxis: {
     triggerEvent: true,
     type: 'category',
     inverse:true,
     axisLabel: {
       formatter: function (value) {
         let res = value;
         if (res.length > 5) {
           res = res.substring(0, 4) + "..";
         }
         return res;
       }
     },
     data: []
   },
 };
 option = {
   tooltip: {
     trigger: 'axis',
     formatter: function (params,ticket,callback) {
       let res = params[0].name;
       for (let i = 0, l = params.length; i < l; i++) {
         res += '<br/>' + params[i].marker + params[i].seriesName + ' : ' + params[i].value + 'KB/s';
       }
       return res
     },
     axisPointer: {
       type: 'shadow'
     }
   },
   legend: {
     itemGap: 15,
     top: 20,
     data: ['流出', '流入']
   },
   color: ['#5170ac', '#77acff'],
   grid: {
     left: '3%',
     right: '4%',
     bottom: '0%',
     containLabel: true
   },
   xAxis: {
     type: 'value',
     position: 'top',
     show : false,
   },
   yAxis: {
     triggerEvent: true,
     type: 'category',
     inverse:true,
     axisLabel: {
       formatter: function (value) {
         let res = value;
         if (res.length > 5) {
           res = res.substring(0, 4) + "..";
         }
         return res;
       }
     },
     data: []
   },
 };